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检索条件"机构=Fujian Key Laboratory of Smart Grid Protection and Operation Control"

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Improved Droop control for Power grid Considering State-of-charge of Battery Energy Storage

Improved Droop Control for Power Grid Considering State-of-c...

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Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Yuge Chen Zhicheng Li Chaoping Deng Weijun Zhang Shuling Zhang Tongtong Gao Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fuzhou China

The constant droop coefficient (DC) in the traditional f-P and V-Q droop control is not conducive to the state-of-charge (SoC) management of the battery energy storage (BES) system. This paper proposes an improved droop control strategy (DCS) for the power grid which considers both the power frequency adjustment of the power system and the SoC management constraints of the BES. The proposed improved DCS is enabled to adjust the DC according to the SoC status of the BES. Case studies verify the effectiveness of the proposed DCS, which significantly reduces the frequency change deviation in the dynamic process of the weak power grid.

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High-performance Full Electromagnetic Transient Simulation System of fujian Power grid and its Application

High-performance Full Electromagnetic Transient Simulation S...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Zhicheng Li Zhijun Tang Dongyuan Zhang Wujie Chao Xiaoyan Peng Yongjie Leng Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian China Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fuzhou China Integrated Electronic Systems Lab Co. Ltd. Jinan China

ISBN: (纸本)9781665434263

This paper proposes a high-performance full electromagnetic transient simulation system of fujian power grid. The system is developed based on the General Transient Simulator (GTS), which is a self-developed electromagnetic transient simulation tool. The key technologies of the simulation system, such as the high-performance automatic parallel computing technology and the large time step electromagnetic transient simulation technology, are introduced. The full electromagnetic transient simulation of the AC power system above 10kV in fujian power grid based on the dispatching control cloud platform is realized. Study cases are carried out and the validity and accuracy of the simulation are verified by comparing the actual fault recording data and simulation waveforms.

关键词： Cloud computing Computational modeling System integration Power system stability Parallel processing Power grids Dispatching

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Study on the Corresponding Relationship Between Critical Points of P-V Curve and V-Q Curve of Simple Thevenin Equivalent System

Study on the Corresponding Relationship Between Critical Poi...

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Electrical Engineering (CIYCEE), IEEE China International Youth Conference on

作者： Xuan Li Zhaowei Li Linlin Guan Xuelian Wu Yan Mei Jun Li State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing China

ISBN: (数字)9781728196596

ISBN: (纸本)9781728196602

With the further increase in power demand for highly concentrated load centers and the gradual formation of a power system with a high proportion of new energy sources, China will face severe risk of voltage instability. In this paper, firstly, the load bus voltage equation of simple Thevenin equivalent system is derived, and then the P-V and V-Q curves are obtained respectively. Secondly, the mutual restriction relationship between active and reactive power of load is discussed when there is a real value solution to the voltage. Finally, the relationship between the voltage of critical points of the P-V curves and the reactive power of the load, and the relationship between the voltage of critical points of the V-Q curves and the active power of the load are deduced respectively. The relationship of one-to-one correspondence between critical points of P-V curves and critical points of V-Q curves is proved according to the mutual restriction between active power and reactive power of load and monotonicity of critical voltage and load power function.

关键词： Electrical engineering Reactive power Power demand Conferences Power system stability Faces

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Design and Verification of a DC Direct-mounted Energy Storage Topology

Design and Verification of a DC Direct-mounted Energy Storag...

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IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Junwei Huang Wujie Chao Chaoping Deng Liyu Dai Jinke Wang Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (数字)9798350370805

ISBN: (纸本)9798350370812

The modular multilevel converter based battery energy storage system (MMC-BESS) has the problem of pulsating current affecting battery life, and the high cost of retrofitting traditional modular multilevel converter (MMC) stations. The proposed DC direct-mounted energy storage topology in this paper is battery friendly and required number of battery cells is only 1/6 of MMC-BESS, greatly saving costs. This paper analyzes the topology structure and working principle of DC direct-mounted energy storage devices, and proposes a design method for the DC direct-mounted energy storage devices. The proposed design method is validated through simulation and prototype experiments. The simulation and construction of a DC 750V prototype have verified that the prototype has achieved good charging and discharging functions for DC energy storage, with small fluctuations in DC grid connected current and good power control effect. This study can provide reference and guidance for the design and application of high-voltage and high-capacity direct current energy storage devices that support offshore wind power to move towards the deep sea in the future.

关键词： Multilevel converters Fluctuations Costs Power control Prototypes High-voltage techniques Wind power generation Topology Batteries Energy storage

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Transient Performance Optimization of grid Forming Converter

Transient Performance Optimization of Grid Forming Converter

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Sichao Wang Chunpeng Li Yuexi Yang Congda Han Hanbin Zhang Junwei Huang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Contorl for Smart Grid State Grid Fujian Electric Power Research Institute Fuzhou China

With the increased penetration of renewable energy sources (RES), the power system is emerging a lower inertial characteristic. This can lead to a higher rate-of-change of frequency (RoCoF) and the voltage instability issue during grid disturbance conditions, thus threatening the security of the power grid. Accordingly, researchers have recently proposed a novel grid-forming (GFM) control strategy. Compared to the traditional grid-following (GFL) control method, the GFM control can emulate the dynamic behaviors of the synchronous generator (SG), inherently providing inertial support to stabilize the grid frequency and transient AC voltage. However, it may lead to abnormal transient stress, such as over/under DC voltage and AC overcurrent, raising the risk of unexpected tripping. The paper will present the operating principles of multiple types of GFM and GFL control strategies, and evaluate their dynamic performance during the grid voltage variation events. To address the issue of transient stress, the paper will propose a novel control strategy for suppressing the over/under DC voltage and AC overcurrent so that prevented disconnection of the GFM converters. The proposed method is validated with an example of PV generation scenario, and the effectiveness in improving the dynamic performance has been demonstrated by studying the frequency variation cases.

关键词： Power system dynamics Power system stability Valves Frequency conversion Stability analysis Voltage control Transient analysis

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Developing Characteristics of Oil-immersed Transformer Internal Fault with Dignostic Method Using Convergence Patterns of Free Gas

Developing Characteristics of Oil-immersed Transformer Inter...

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Electrical Engineering (CIYCEE), IEEE China International Youth Conference on

作者： Yucheng Zhang Zhiguo Hao Yuping Zheng Shuyan Pan Boyu Li Zhongxin Xue Jinzhao Deng School of Electrical Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China

ISBN: (纸本)9781665400657

Light gas protection only operates when gas within the transformer collection chamber reaches threshold volume. Such criterion failed to reflect transformer conditions accurately due to the lack of understanding for defect developing process and corresponding gas generation- convergence pattern, which has led to lower protection reliability and has caused several transformer explosions. To address current problem, an experimental tank with structure resembling that of a power transformer is set up, inside which the needle-plate oil-pressboard breakdown model is planted. Experimental results indicate that throughout fault development, voltage drops became more frequent until arcing occurs, so is HFCT signal; meanwhile gas generation rate increases through slight partial discharge, spark discharge and arcing stage, the collected gas volume corresponds with patterns above. The purpose of this study is to clarify the defect developing process and the gas generation-convergence pattern for oil-immersed transformer internal fault in guidance for a more reliable protection method.

关键词： Surface discharges Windings Oil insulation Discharges (electric) Reliability Sparks Plastics

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Assessment of Static Voltage Stability Margin for Power Systems with Causal Decomposition and Reverse Feature-Enhanced Temporal Convolutional Networks

Assessment of Static Voltage Stability Margin for Power Syst...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Haifeng Zhou Xianyu Zha Qi Pan Naishuang Li Jiabin Zhang Jiacheng Liu State Key Laboratory of Smart Grid Protection and Operation Control NARI Group Corporation (China Electric Power Research Institute) Nanjing China

ISBN: (数字)9798350386127

ISBN: (纸本)9798350386134

Rapid and accurate static voltage stability assessment is crucial for the safe operation of large-scale interconnected power grids. Existing methods have failed to effectively filter key input variables in massive measurement data, limiting assessment accuracy. This study proposes an assessment method based on causal decomposition and reverse feature-enhanced temporal convolution networks. Initially, using bottom-layer measurement data as input, key variables are selected through causal decomposition, reducing the original feature set and enhancing computational efficiency. Subsequently, a reverse feature-enhanced temporal convolution model is constructed to fully mine data characteristics and achieve high precision assessment. Validation in an improved four-machine two-area simulation system demonstrates that this method significantly enhances estimation accuracy and algorithm performance while reducing the dimensionality of original variables.

关键词： Adaptation models Accuracy Correlation Convolution Power system stability Predictive models Feature extraction Stability analysis Data models Convolutional neural networks

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A Coordinated MMC control Strategy of Integrated Photovoltaic/Battery System

A Coordinated MMC Control Strategy of Integrated Photovoltai...

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IEEE International Conference on Energy Internet (ICEI)

作者： Yuexi Yang Xiao Zhou Sichao Wang Chunpeng Li Junwei Huang Wenzheng Xu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Control for Smart Grid State Grid Fujian Electric Power Research Institute. Fuzhou China National Research Center for Active Distribution Network Technology Beijing Jiaotong University. Beijing China

The grid-connecting control and maximum power point tracking control of photovoltaic inverters have long been the research focus in the field of solar power generation. In this paper, a new coordinated modular multilevel converter (MMC) control strategy based on virtual synchronization and MPPT is proposed for grid-connected inverters in the PV/Battery system. The proposed strategy realizes frequency and voltage droop control with the synchro's inertia and damping characteristics, and improves the power angle stability as well as system voltage stability. Simulation results in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed control strategy.

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Real Time Monitoring Method of Comprehensive Energy Consumption Based on Data Mining Algorithm

Real Time Monitoring Method of Comprehensive Energy Consumpt...

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作者： Qian, Gang Tang, Chenghong Meng, Yao Qi, Xiaomin Wang, Jingtao Zhou, Jing State Grid Shaoxing Power Supply Company Zhejiang Shaoxing312099 China State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Development Limited Company Nanjing211106 China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China China Electric Power Planning and Engineering Institute Beijing100120 China Beijing Nari Digital Technology Co. Ltd. Beijing100085 China

With the expansion of data centers, total consumption is growing exponentially. The center is faced with problems such as reducing power consumption, reducing costs and improving resource utilization. Reducing energy costs through monitoring is an important means of energy conservation in data centers. In recent years, more and more real-time energy consumption data are stored on the energy consumption management platform. There is a wealth of knowledge hidden in the energy consumption data in recent years. A large amount of data simplifies the traditional methods, and data mining methods have achieved good results in many fields. Therefore, it is of great significance to study a new energy consumption monitoring system and introduce data mining method into the system. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Energy utilization

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Influence of capacitive voltage transformer parameters on harmonic transmission characteristics

Influence of capacitive voltage transformer parameters on ha...

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12th International Conference on Renewable Power Generation (RPG 2023)

作者： X. Li T. Wu Y. Lv J. Jiang C. Zhang State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing People's Republic of China Xi'an Jiaotong University Xi'an People's Republic of China

Capacitive voltage transformer (CVT) has the advantages such as low insulation cost, small size and large electric field strength margin, so it is widely used in voltage measurement, relay protection and high frequency communication. However, CVT has the capacitors and inductors in its structure, these components are sensitive to frequency, so it can not accurately measure harmonics. Considering the stray capacitance and coupling capacitance of capacitive voltage transformer, the broadband response equivalent circuit model of CVT is established, and a cascade hierarchical analysis method is proposed to deduce the complete transfer function. On this basis, the influence of key parameters of CVT on harmonic transmission characteristics is simulated and analysed. The simulation results show that the increase of compensation reactor stray capacitance will make the resistance band move to the low frequency direction, the stray capacitance of the primary side of the intermediate transformer affects the attenuation degree of the high frequency band, and the effect of secondary side of transformer stray capacitance on the frequency response of CVT can be ignored. The results have reference significance for accurate harmonic measurement and manufacturing of CVT.

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